<!DOCTYPE html>
<html>
<head> 
<meta charset="utf-8"> 
<title>demo</title> 
</head>
<body bgcolor="burlywood" >
 
<div id="container" style="width:100%  >
 
	<div id="header" style="background-color:#FFA500;text-align:center;">
		<h1 style="margin-bottom:0;">主要的网页标题</h1>
	</div>
	 
	<div id="menu" style="background-color:#FFD700;height:200px;width:50%; float:left;">
		<b>菜单</b><br>
		HTML<br>
		CSS<br>
		JavaScript
	</div>
	 
	<div id="content" style="background-color:#EEEEEE;height:200px;width:25%; float:left;">
		内容在这里
	</div>
	 
	<div id="footer" style="background-color:#FFA500;clear:both;">
		<form action="https://pan.baidu.com/s/1OdIiXDex0N9pPLkoaeEelg" method="get">
			Username: <input type="text" name="pwd"><br>
			<!-- Password: <input type="password" name="password"><br /> -->
			<input type="submit" value="提交">
		</form>
		<p><a href="https://www.csdn.net/" target="iframe_a" rel="noopener">transmit</a></p>
		<h1 style="text-align: center;">欢迎观看哔哩哔哩</h1>
		<iframe loading="lazy" src="http://bilibili.com" width=100% height=600  name="iframe_a">
			<h1 style="text-align: center;" >Test</h1>
		</iframe>
	</div>
	<div id="footer" style="background-color:skyblue;clear:both;">
		<form action="">
			<textarea style="border: 10px;margin: 20px;">
				<h1>h1h1h1h1</h1>
				<p>ppppp</p>
			</textarea>
			<br />
			<input type="radio" name="sex" value="male">男<span style="width: 300px;">abcabcabc</span>
			<input type="radio" name="sex" value="female">女
		</form>
	 </div>
</div>
 
</body>
</html>